Yes, the Corsair K55 Pro XT is also available in the German QWERTZ keyboard layout. The keyboard is delivered with the appropriate keyboard layout depending on the region, and the model with the product ID "CH-9226715-DE" is specially configured for the German market and thus in the QWERTZ layout.

It is not possible to change the keyboard layout on the software side, as it is physically fixed on the keyboard. So if you need a QWERTY layout, you should make sure that you get the German model.